Incompatibility with Minehut, kicked from proxy server

[JerichoTorrent]

Describe the bug
Seems PacketEvents has an incompatibility with Minehut. I am reporting this to Minehut as well. When players switch servers using /server they will often get kicked out of the network and back to the Minehut lobby. This only happens when players are connected to the proxy server that uses Minehut's API.
Stacktrace:

[23:26:37 INFO]: [connected player] JerichoTorrent (<ip address withheld>) has disconnected: An internal error occurred in your connection.
[23:26:37 ERROR]: [connected player] JerichoTorrent (<ip address withheld>): exception encountered in com.velocitypowered.proxy.connection.client.ClientConfigSessionHandler@7f1ce41d
io.netty.handler.codec.DecoderException: com.github.retrooper.packetevents.exception.PacketProcessException: Failed to map the Packet ID 26 to a PacketType constant. Bound: SERVER, Connection state: CONFIGURATION, Server version: 1.21
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:98) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:289) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:333) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:455) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1357) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:868) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:799) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:501) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:399) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
Caused by: com.github.retrooper.packetevents.exception.PacketProcessException: Failed to map the Packet ID 26 to a PacketType constant. Bound: SERVER, Connection state: CONFIGURATION, Server version: 1.21
        at com.github.retrooper.packetevents.event.ProtocolPacketEvent.<init>(ProtocolPacketEvent.java:90) ~[?:?]
        at com.github.retrooper.packetevents.event.PacketReceiveEvent.<init>(PacketReceiveEvent.java:31) ~[?:?]
        at com.github.retrooper.packetevents.event.simple.PacketConfigReceiveEvent.<init>(PacketConfigReceiveEvent.java:34) ~[?:?]
        at com.github.retrooper.packetevents.util.EventCreationUtil.createReceiveEvent(EventCreationUtil.java:40) ~[?:?]
        at io.github.retrooper.packetevents.handlers.PacketEventsDecoder.read(PacketEventsDecoder.java:54) ~[?:?]
        at io.github.retrooper.packetevents.handlers.PacketEventsDecoder.decode(PacketEventsDecoder.java:80) ~[?:?]
        at io.github.retrooper.packetevents.handlers.PacketEventsDecoder.decode(PacketEventsDecoder.java:40) ~[?:?]
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88) ~[server.jar:3.4.0-SNAPSHOT (git-965db127-b454)]
        ... 33 more

Software brand
Velocity 3.4.0-SNAPSHOT (git-965db127-b454)

Plugins
connection-guard, luckperms, velocitycontrol, ezdiscordlinkvelocityv2 (custom plugin developed in-house, problem was present before this was added), litebans, mysqldriver, nuvotifier, packetevents, pl-hide-pro, redisbungee, plan, plasmovoice, spark, staffplusplus-network, tebex, vcustombrand, vivecraft_velocity_extensions, votingplugin, vulcan

How To Reproduce

1. Join on a server connected to Minehut (see their docs https://support.minehut.com/hc/en-us/articles/33252734474899-How-to-Setup-a-Minehut-External-Hosted-Server)
2. Switch servers using Velocity's /server
3. Get kicked back to the Minehut lobby
4. Rinse and repeat a few times and you can actually connect to the server you want to; takes 3 or 4 tries without getting kicked

Expected behavior
Player can connect to the server just fine and switch servers as he pleases.

Screenshots
N/A

Additional context
Add any other context about the problem here.

[sprytex]

use normal hosting

[JerichoTorrent]

use normal hosting

Erm... what. We're not using them as a host. We use their API on a second proxy server to connect to their network. It's pretty common? They have over 2,000 servers. I am for sure not the only one on their network that uses packetevents.